the driver tube 6SN7 signal input always connect to pin 4. Any difference if connect to pin 1?
Thanks for reply. If driver circuit designed mainly for only pin 4 input or doesn't matter and can connect pin 1 or 4?That's a dual triode, so there are two separate active devices in one envelope, each with
its own grid, plate, and cathode. You can use either of the devices for any particular function.